Abstract

A compact ammonia sensor based on a 10-µm
single-frequency, thermoelectrically cooled, pulsed quantum-cascade
laser with an embedded distributed feedback structure has been
developed. To measure NH3 concentrations, we scanned
the laser over two absorption lines of its fundamental ν2
band. A sensitivity of better than 0.3 parts per million was
achieved with just a 1-m optical path length. The sensor is
computer controlled and automated to monitor NH3
concentrations continuously for extended periods of time and to store
data in the computer memory.

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